1. not accounted for or made clear; having no explanation given

Examples

• The police found unexplained marks on the door.
• There was an unexplained delay in the flight schedule.
• Scientists are studying the unexplained phenomenon.
• Her sudden disappearance remains unexplained.
• The company reported unexplained losses in revenue.
• Strange, unexplained noises came from the attic.
• The unexplained absence worried his family.